Abstract:
In a thermostatic valve for a radiator, a tappet is arranged to be displaced axially by a thermostatic element (K), and in turn displaces a closure member (3) by way of a pin (6). Between the tappet (16) and the pin (6) there is arranged a stroke amplifier (23) having two ramps (25, 26) and an amplifier element (24) arranged therebetween. On axial movement of the tappet (16), the amplifier element (24) executes a transverse or rotary movement. This causes the distance between the tappet (16) and the pin (6) to change. A stroke amplification is achieved in this manner.
Abstract:
A security device for a thermostat (1) for securing the thermostat (1) against theft and against damage and for securing a rotary knob (7) on the thermostat housing (6), which knob serves for adjustment of the desired value, against a predefined rotation, contains a security sleeve (4) which on the one hand engages over the coupling between the thermostat housing (6) and the adjusting valve and on the other hand engages over the rotary knob (7) and is arranged to be non-rotatably connected to the thermostat housing (6) and the rotary knob (7). So that the rotary knob (7) can be locked not only at a predetermined desired value, but can also be adjustable over a selectable range of desired values which is smaller than the normal adjustment range, provision is made for a coupling element (5) to be arranged between the rotary knob (7) and the security sleeve (4); in different rotated angular positions in relation to the rotary knob (7) the coupling element is either arranged to be non-rotatably coupled to the knob and to the security sleeve (4), or allows a limited rotation of the rotary knob (7) relative to the thermostat housing (6) for an adjustment of the desired value between two desired value limits, of which at least one limit is selectable by the non-rotatable coupling of the coupling element (5) in a rotated angular position, corresponding to this desired value limit, relative to the rotary knob (7).
Abstract:
A hydraulic machine (1) is disclosed, with an annular gear (3) with internal teeth (6, 7) and, eccentrically mounted in the annular gear, a gearwheel (2) with external teeth (4, 5) which engage with the internal teeth, the external teeth comprising one more tooth than the internal teeth and the contour of the external teeth being formed by an envelope of a system of generating circles (14), the midpoints of which lie on a trochoid (9) which, as a rolling circle (10) rolls without slipping on a base circle (11), can be generated by the movement of a point lying on a radial ray of the rolling circle co-rotating with the rolling circle. A method of producing the contour of a gear wheel of such a machine is also disclosed. In such a machine it is desirable to realise a satisfactory inner seal and low Hertzian stresses. To that end, the spacing of the point from the midpoint of the rolling circle (10) is larger than the radius of the rolling circle (10). The tooth form can then be formed by the end points of a system of line segments which are located at right angles to the trochoid (9) and are the same length as the radii of the generating circles (14), wherein the trochoid (9) encloses a closed inner face and separates it from an outer face and several intermediate faces, and the line segments are arranged only in the inner face.
Abstract:
A hydraulic axial piston machine is disclosed, having an inclined plate (7), on which a slider shoe (9) of at least one piston slides on relative movement between a cylinder body (2) receiving the piston and the inclined plate (7), and a pressure plate (10) articulated on the cylinder body (2) and holding the slider shoe (9) in engagement with the inclined plate. It is desirable for such a machine also to be operable with a hydraulic fluid that has no lubricating properties. For that purpose, between the pressure plate (10) and the cylinder body (2) there is arranged a bearing element (18) with a bearing surface (19) of plastics material, which slides with low friction on a counterpart (15) made of metal lying against the bearing surface (19).
Abstract:
A hydraulic piston machine is proposed, with a cylinder body (1), which comprises at least one cylinder (2) with a piston (3) movable therein, and a control counter-plate (7) which engages the cylinder body (1) by way of a contact surface (6) and, on relative movement between the cylinder body and the control counter-plate parallel to the contact surface, connects the cylinder in dependence upon its position with inlet and outlet channels (11, 12) respectively, the control counter-plate (7) and/or the cylinder body (1) being provided, at least in the region of the contact surface (6, 9), with a friction-reducing layer (13). A machine of that kind should be inexpensive to manufacture yet should operate reliably even when the hydraulic fluid has no or only slight lubricating properties. For that purpose the friction-reducing layer (13) is in the form of an injection-moulded part.
Abstract:
A method for mounting a cylinder sleeve (3) in a base member (1) is disclosed, in which the cylinder sleeve (3) is inserted in the base member (1) and the outer diameter of the inserted cylinder sleeve is enlarged at one end, and a hydraulic machine with a base member (1) in which at least one cylinder sleeve (3) is arranged in a cylinder bore (2). In this connection, it is desirable to be able to use materials for the cylinder sleeve that could not previously be satisfactorily fixed in the base member (1). For that purpose, the cylinder sleeve (3) is heated before the outer diameter is enlarged. The cylinder bore (2) has at at least one end a gradual enlargement (12) of diameter and the cylinder sleeve (3) has an enlargement (7) of its outer diameter matched to this enlargement (12) of diameter.
Abstract:
A hydraulic system with a pump (1) of fixed positive displacement, a tank (42) and a valve group connected via a tank line (118) to the tank (22) is disclosed, which has at least one load valve (105 to 107) and a control section (103) comprising a pilot overflow valve (16) for control of the hydraulic fluid supplied to the load valve in accordance with demand. In a system of that kind, it is desirable to be able to arrange an auxiliary valve arrangement in the tank line without the function of the system being adversely affected. For that purpose, besides the auxiliary valve arrangement (31) provided in the tank line (118) for controlling a further hydraulic load, provision is made for the discharge side of the pilot overflow valve (16) to be connected to a point of constant pressure.
Abstract:
A hydraulic steering arrangement for vehicles is proposed, with a steering motor (5), a flow amplifier (4) in fluid connection therewith, which amplifies a fluid flow measured by a steering measuring device (1), at least one sensor (10, 11, 13), which determines a performance characteristic of the vehicle, and a control device (9), which changes the amount of fluid supplied to the steering motor in dependence on an output signal of the sensor. In a steering arrangement of that kind, it is intended to correct or adapt the steering behaviour to the operational state of the vehicle using simple means. For that purpose, the control device (9) changes the amplification factor of the flow amplifier (4).
Abstract:
The present invention pertains to a four-way valve for a heat-pump arrangement. The valve comprises a housing with four fluid connection ports, a rotatable valve element for switching the connections between the fluid connection ports, an actuator for rotating the valve element and sensor components on a low pressure side and a high pressure side of the valve for measuring properties of the fluid inside the housing. The invention is also directed at a heat-pump arrangement comprising a corresponding four-way valve and a housing for a four-way valve.
Abstract:
A refrigerant system according to an example of this disclosure includes a main refrigerant loop in communication with a condenser, an evaporator, and a compressor. A heat exchanger is arranged to cool electronic components. The heat exchanger has a cooling line, which is configured to receive refrigerant from the main refrigerant loop and a heat sink in communication with air surrounding the electronic components.